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r
Combined from primary sources listed below.

In IO::Special§

See primary documentation in context for method r 

method r(IO::Special:D: --> Bool)

The 'read access' file test operator, returns True if and only if this instance represents the standard input handle(<STDIN>).

In IO::Path§

See primary documentation in context for method r 

method r(IO::Path:D: --> Bool:D)

Returns True if the invocant is a path that exists and is accessible. The method will fail with X::IO::DoesNotExist if the path points to a non-existent filesystem entity.